package com.sxpcwlkj.framework.utils;
import cn.hutool.core.util.StrUtil;
import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import java.net.InetAddress;
import java.net.UnknownHostException;


@Slf4j
public class IPUtils {

    /**
     * 获取IP地址
     *
     * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        if(request==null){
            request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        }
        String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StrUtil.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StrUtil.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StrUtil.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StrUtil.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StrUtil.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
            log.error("IPUtils ERROR：",e);
        }

        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if(!StrUtil.isEmpty(ip) && ip.length() > 15) {
            if(ip.indexOf(",") > 0) {
                ip = ip.substring(0, ip.indexOf(","));
            }
        }

        return ip;
    }


    public static String getUserRealIP(HttpServletRequest request) throws UnknownHostException {
        String ip = "";

        // 有的user可能使用代理，为处理用户使用代理的情况，使用x-forwarded-for

        if  (request.getHeader("x-forwarded-for") == null)  {

            ip = request.getRemoteAddr();

        }  else  {

            ip = request.getHeader("x-forwarded-for");

        }

        if  ("127.0.0.1".equals(ip))  {

            // 获取本机真正的ip地址

            ip = InetAddress.getLocalHost().getHostAddress();

        }
        return ip;
    }

}
